Abstract
Pulsars are always said to be rotating neutron stars. The grounds for that belief were launched very quickly after pulsars were discovered. The regularity of the pulses suggested that either pulsation or rotation must serve as the clock, and the fast rate of the pulses then requires an extreme density, since for gravitationally bound objects the frequency is limited by the square root of the density. The object would simply fly apart at higher frequencies. Even the densest known objects, the white dwarf stars, could not account for the fast pulsars, and so astronomers turned to the even more dense theoretically anticipated neutron stars. Since the vibration frequency of neutron stars was too high, the conclusion settled on rotating neutron stars.
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Mertz, L. (1996). Pulsars. In: Excursions in Astronomical Optics. Springer, New York, NY. https://doi.org/10.1007/978-1-4612-2386-3_6
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